Control scale
Use the control height that matches the surrounding density. Button already consumes this scale through its size variants.
--size-control-xs24px--size-control-sm28px--size-control-md32px--size-control-lg36px--size-control-xl40pxIcons and targets
Icon geometry follows the control rather than competing with its label. Standalone interactive controls must have a target large enough to use comfortably, even when the visible glyph is smaller.
Guidance
Do
Keep the visible icon optically centered while the Button supplies the full control target.
Do not
Make an icon-only control smaller than its neighboring target just to fit more controls on one row.
Spacing between controls belongs to the Spacing scale; sizing answers how large the control itself should be.